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    <script>
        //     ### every 每一项
        //       ```js
        //        const 布尔值 = arr.every(item => 条件);
        //       ```
        //     MDN：https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/every
        //     注意点：
        //     1. 条件的每一项结果为 真值 ，最终才为`true`。如果有一项为假，结果就为假，并且停止。
        //     2. 若收到一个空数组，此方法在一切情况下都会返回`true`。


        const cartList = [
        { goods_id: 11, goods_name: '商品1', goods_selected: true },
        { goods_id: 33, goods_name: '商品3', goods_selected: true },
        { goods_id: 22, goods_name: '商品2', goods_selected: true },
        { goods_id: 44, goods_name: '商品4', goods_selected: true },
        { goods_id: 66, goods_name: '商品5', goods_selected: true },
        ]

        // const selectedAll = cartList.every(item=>{
        //     return item.goods_selected === true;
        // })

        // 简化后
        const selectedAll = cartList.every(item=> item.goods_selected)

        console.log(selectedAll)
    </script>
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